人民长江2025，Vol.56Issue(7)：9-18,10.DOI:10.16232/j.cnki.1001-4179.2025.07.002
长江陆溪口鹅头洲土壤重金属空间分布及源解析
Spatial distribution and source identification of heavy metals in soil at Luxikou goose-head braided channel of Changjiang River
摘要
Abstract
The Luxikou goose-head braided channel in middle reaches of the Changjiang River is situated in national nature reserve.In order to identify the spatial distribution and sources of heavy metals in the soil,and to serve the regional ecological en-vironment and species protection,43 soil samples were collected to analyze the contents and spatial distribution characteristics of heavy metals(As,Cd,Cr,Cu,Hg,Ni,Pb,Zn),including topsoil(0～20 cm)and subsoil(50～200 cm)in Luxikou braided channel before and after flooding.Heavy metal risk was evaluated and the sources were analyzed by principal component analysis and PMF model.The results showed that:① the ratio of heavy metal elements in surface soil to the background value of Hubei Province followed the order Cd>Cu>Pb>Zn>Hg>Ni>Cr>As,and the concentrations in topsoil were higher than those in subsoils.② On spatial distribution,the soil heavy metal elements in the zone were concentrated in the middle of the head of Zhongzhou and the tail of Xinzhou.The metals were deposited on the surface,and migrated towards the center of the zone.After flooding,heavy metal concentrations near the river channel decreased,while it increased near the center of the zone.③According to geo-accumulation index and potential ecological risk index,Cd was classified as moderately polluted(The average of Igeo was 1.26)and at strong potential ecological risk(The average of Eir was 116.32),Hg was at moderate risk(The average of Eir was 52.77),while the remaining elements were mostly unpolluted and posed a low potential risk.④ Based on principal component and PMF source analysis,Pb originated from both natural geological background and river transportation with roughly equal contri-bution,while Hg primarily came from shipping fuel combustion emissions.The others mainly originated from natural geological backgrounds.The soil heavy metals in Luxikou goose-head braided channel mainly come from the natural geological background and waterway transportation,and their contributions accounted for74.56%and25.44%,respectively.Supervision of the use and management of fuel oil by vessels in the waterway can be strengthened to further protect regional species and the ecological securi-ty of the Changjiang River.关键词
土壤重金属/空间分布/来源分析/陆溪口/鹅头洲/长江中游Key words
soil heavy metals/spatial distribution/source identification/Luxikou/goose-head braided channel/middle rea-ches of the Changjiang River分类
资源环境引用本文复制引用
朱晛亭,徐子佳,李煜,高强,崔倩倩,徐聪..长江陆溪口鹅头洲土壤重金属空间分布及源解析[J].人民长江,2025,56(7):9-18,10.基金项目
白鱀豚国家自然保护区专项调查与监测(第一包)项目(HBJXCD(2023)053) （第一包）
湖北省地质局民生地质项目(MSDZ202503) （MSDZ202503）
湖北省自然科学基金面上类青年项目(2024AFB438) （2024AFB438）
